Consider events A, B, C, D, E of the sample space S = {n : n is an integer such that 10 ≤ n ≤ 20} given by :
A is the set of all even numbers.
B is the set of all prime numbers.
C = {15}.
D is the set of all integers ≤ 16.
E is the set of all double digit numbers expressible as a power of 2.

B and C are

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